How frequently should one change their bed sheets?
Here at the field station, the answer is once a week.
My colleague's 18yo daughter just started working here as a house cleaner for the summer. Today, she told her mum (who then told me) that they were cleaning my room and apparently the older ladies were curious why I hadn't changed my sheets (despite leaving me a fresh set every week).
I thought I was being considerate. Instead they think I am a pig.